Annulus

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

An annulus is the ring-like or collar-like structure sometimes found on the stipe of some species of mushrooms. The annulus represents the remnants of the partial veil, after it has ruptured to expose the gills or other spore-producing surface.

Excerpt from the Wikipedia article “Annulus (mycology)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: No machine-readable author provided. Kingfisher~commonswiki assumed (based on copyright claims)., CC BY-SA 2.5, via Wikimedia Commons.